drivers/leds/leds-clevo-mail.c

   1
   2 #include <linux/module.h>
   3
   4 #include <linux/platform_device.h>
   5 #include <linux/err.h>
   6 #include <linux/leds.h>
   7
   8 #include <linux/io.h>
   9 #include <linux/dmi.h>
  10
  11 #include <linux/i8042.h>
  12
  13 #define CLEVO_MAIL_LED_OFF              0x0084
  14 #define CLEVO_MAIL_LED_BLINK_1HZ        0x008A
  15 #define CLEVO_MAIL_LED_BLINK_0_5HZ      0x0083
  16
  17 MODULE_AUTHOR("Márton Németh <nm127@freemail.hu>");
  18 MODULE_DESCRIPTION("Clevo mail LED driver");
  19 MODULE_LICENSE("GPL");
  20
  21 static unsigned int __initdata nodetect;
  22 module_param_named(nodetect, nodetect, bool, 0);
  23 MODULE_PARM_DESC(nodetect, "Skip DMI hardware detection");
  24
  25 static struct platform_device *pdev;
  26
  27 static int __init clevo_mail_led_dmi_callback(const struct dmi_system_id *id)
  28 {
  29         printk(KERN_INFO KBUILD_MODNAME ": '%s' found\n", id->ident);
  30         return 1;
  31 }
  32
  33 /*
  34  * struct mail_led_whitelist - List of known good models
  35  *
  36  * Contains the known good models this driver is compatible with.
  37  * When adding a new model try to be as strict as possible. This
  38  * makes it possible to keep the false positives (the model is
  39  * detected as working, but in reality it is not) as low as
  40  * possible.
  41  */
  42 static struct dmi_system_id __initdata mail_led_whitelist[] = {
  43         {
  44                 .callback = clevo_mail_led_dmi_callback,
  45                 .ident = "Clevo D410J",
  46                 .matches = {
  47                         DMI_MATCH(DMI_SYS_VENDOR, "VIA"),
  48                         DMI_MATCH(DMI_PRODUCT_NAME, "K8N800"),
  49                         DMI_MATCH(DMI_PRODUCT_VERSION, "VT8204B")
  50                 }
  51         },
  52         {
  53                 .callback = clevo_mail_led_dmi_callback,
  54                 .ident = "Clevo M5x0N",
  55                 .matches = {
  56                         DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
  57                         DMI_MATCH(DMI_PRODUCT_NAME, "M5x0N")
  58                 }
  59         },
  60         {
  61                 .callback = clevo_mail_led_dmi_callback,
  62                 .ident = "Positivo Mobile",
  63                 .matches = {
  64                         DMI_MATCH(DMI_BOARD_VENDOR, "CLEVO Co. "),
  65                         DMI_MATCH(DMI_BOARD_NAME, "M5X0V "),
  66                         DMI_MATCH(DMI_PRODUCT_NAME, "Positivo Mobile"),
  67                         DMI_MATCH(DMI_PRODUCT_VERSION, "VT6198")
  68                 }
  69         },
  70         {
  71                 .callback = clevo_mail_led_dmi_callback,
  72                 .ident = "Clevo D410V",
  73                 .matches = {
  74                         DMI_MATCH(DMI_BOARD_VENDOR, "Clevo, Co."),
  75                         DMI_MATCH(DMI_BOARD_NAME, "D400V/D470V"),
  76                         DMI_MATCH(DMI_BOARD_VERSION, "SS78B"),
  77                         DMI_MATCH(DMI_PRODUCT_VERSION, "Rev. A1")
  78                 }
  79         },
  80         { }
  81 };
  82
  83 static void clevo_mail_led_set(struct led_classdev *led_cdev,
  84                                 enum led_brightness value)
  85 {
  86         if (value == LED_OFF)
  87                 i8042_command(NULL, CLEVO_MAIL_LED_OFF);
  88         else if (value <= LED_HALF)
  89                 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
  90         else
  91                 i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
  92
  93 }
  94
  95 static struct led_classdev clevo_mail_led = {
  96         .name                   = "clevo",
  97         .brightness_set         = clevo_mail_led_set,
  98 };
  99
 100 static int __init clevo_mail_led_probe(struct platform_device *pdev)
 101 {
 102         return led_classdev_register(&pdev->dev, &clevo_mail_led);
 103 }
 104
 105 static int clevo_mail_led_remove(struct platform_device *pdev)
 106 {
 107         led_classdev_unregister(&clevo_mail_led);
 108         return 0;
 109 }
 110
 111 #ifdef CONFIG_PM
 112 static int clevo_mail_led_suspend(struct platform_device *dev,
 113                                   pm_message_t state)
 114 {
 115         led_classdev_suspend(&clevo_mail_led);
 116         return 0;
 117 }
 118
 119 static int clevo_mail_led_resume(struct platform_device *dev)
 120 {
 121         led_classdev_resume(&clevo_mail_led);
 122         return 0;
 123 }
 124 #else
 125 #define clevo_mail_led_suspend    NULL
 126 #define clevo_mail_led_resume     NULL
 127 #endif
 128
 129 static struct platform_driver clevo_mail_led_driver = {
 130         .probe          = clevo_mail_led_probe,
 131         .remove         = clevo_mail_led_remove,
 132         .suspend        = clevo_mail_led_suspend,
 133         .resume         = clevo_mail_led_resume,
 134         .driver         = {
 135                 .name           = KBUILD_MODNAME,
 136         },
 137 };
 138
 139 static int __init clevo_mail_led_init(void)
 140 {
 141         int error = 0;
 142         int count = 0;
 143
 144         /* Check with the help of DMI if we are running on supported hardware */
 145         if (!nodetect) {
 146                 count = dmi_check_system(mail_led_whitelist);
 147         } else {
 148                 count = 1;
 149                 printk(KERN_ERR KBUILD_MODNAME ": Skipping DMI detection. "
 150                        "If the driver works on your hardware please "
 151                        "report model and the output of dmidecode in tracker "
 152                        "at http://sourceforge.net/projects/clevo-mailled/\n");
 153         }
 154
 155         if (!count)
 156                 return -ENODEV;
 157
 158         pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
 159         if (!IS_ERR(pdev)) {
 160                 error = platform_driver_probe(&clevo_mail_led_driver,
 161                                               clevo_mail_led_probe);
 162                 if (error) {
 163                         printk(KERN_ERR KBUILD_MODNAME
 164                                ": Can't probe platform driver\n");
 165                         platform_device_unregister(pdev);
 166                 }
 167         } else
 168                 error = PTR_ERR(pdev);
 169
 170         return error;
 171 }
 172
 173 static void __exit clevo_mail_led_exit(void)
 174 {
 175         platform_device_unregister(pdev);
 176         platform_driver_unregister(&clevo_mail_led_driver);
 177
 178         clevo_mail_led_set(NULL, LED_OFF);
 179 }
 180
 181 module_init(clevo_mail_led_init);
 182 module_exit(clevo_mail_led_exit);